Telemetric system



Filed Jan. 2, 1948 Jan. 1950 R. F. PEARSON ,1

TELEMETRIC SYSTEM INVENTOR. f0 144 0 [7 fieawqsom 2 Sheets-fih eet 1Jan. 31, 1950 R. F. PEARSON TELEMETRIC SYSTEM 2 Sheets-Sheet 2 FiledJan. 2, 1948 INVENTOR.

WdQZ J J 3 flab/1ND Eff/4f)? Patented Jan. 31, 1950 Rolland F. Pearson,Brooklyn, N. Y.

Application January 2, 1948, Serial No. 339

4% Claims.

This invention relates to a telemetric system for operating an indicatorat one or more locations in synchronism with a control device.

The invention has in view a telemetric system which is useful fortransmitting to distant points information such as orders from thenavigating or other officer of aircraft or vessel, the speed of rotatingmechanism, readings of instruments and the like.

An object of the invention is to provide a tele- -metric system which isindependent of outside magnetic influences and which is not affected byvariations in the earths magnetic influence.

Still another object of the invention is to provide a telemetric systemof the electrical type .having a plurality of windings in the field ofthe constituting the rotating elements in the control and indicatingdevices, the recessed portion of the rotor of the control devicefunctioning to effect an increased flow of current in the windingadjacent the recessed portion to thereby produce through the respectivetube a flow of current in the corresponding winding of the ind cator forcausing the rotor thereof to align with the magnetic lines of forceproduced by the flow of current in said coil. 4 A further object of theinvention is to provide "a device of the indicated character which isfree of moving electrical contacts so as to eliminate any outsidemagnetic field due to sparking where by the system is particularlyapplicable for use radio and radar control devices.

With the foregoing and other objects in view,

reference is now made to the following specification and accompanyingdrawings in which the preferred embodiments oi'the invention are illustrated.

In the drawings: Fig. l is a schematic view of a telemetric system 1constructed in accordance with the invention with the control andindicator devices in eleva tion.

Fig. 2 is a vertical sectional. view taken approximately on line 2-2 ofthe control device of Fig. 1.

Fig. 3 is a similar view taken approximately (in -line 3-3 of theindicator device of Fig. 1.

provision of a, rotor having a recessed periphery and a rotor in theform of a permanent magnet Fig. 4 is a, view in elevation of the controldevice. Fig. 5 is a view in elevation of the indicator device.

Referring to the drawings by characters of reference, the telemetricsystem includes a control device I!) consisting of a stator l l and arotor 52 journaled for rotation within the stator on a rotatably mountedshaft lit. The stator H is formed with a plurality of circumferentiallyspaced recesses M in theinner periphery thereof which sub-divide theinner periphery of the stator into a plurality of arcuately spaced polesl5, I6, I! and 8. The poles are each provided with a plurality ofcontinuous windings which extend through the recesses M and across theopposite ends of the poles forming coils I9, 20, 2| and 22 about thepoles respectively for producing magnetic fields flowing through thepoles when the coils are connected with a source of alternating currentsupply.

The inner faces of the poles are concentric with the rotor i2 which isspaced from the poles by a narrow air gap with the exception ofanarcuate recessed portion 23 formed in the periphery of the rotor whichportion subtends an arc substantially equal to the arcs of the polesrespectively. This provides a greater air gap between the face of therecessed portion and the faces of the poles so as to increase thereluctance in the magnetic circuit across said air gap between the rotorand the faces of the poles respectively. The increased reluctance willcause a greater voltage drop across 'th'e 'coil Which is-adjacent therecessed portion or the rotor and a corresponding increased flow ofcurrent in the coil. The voltage drop will gradually increase in thecoils respectively as the recessed portion of the rotor approachesradial alignment with the poles respectively and when fully aligned withone of the poles, the coil thereof will have a maximum voltage drop anda maximum flow of current therethrough.

The coils are respectively connected in circuit with the cathode andcontrol grid of vacuum tubes 24, 25, 26 and 21 respectively by conductorwires 28 and 29 leading from the coil is to the cathode and control gridof the vacuum tube 24, conductor wires 30 and 3! leading from the endsof the coil 20 to the cathode and control grid of the vacuum tube 25,conductor wires 32 and 33 leading from the ends of the coil 2!. to thecathode and control grid of vacuum tube 2% and by conductor wires 34 and35 leading from the ends of the coil 22 to the'cathode and control gridof the vacuum tube 21.

The telemetric system also includes one or more indicators 36 consistingof a stator 31 and a rotor 38 which is journaled for rotation within thestator on a rotatably mounted shaft 39. The stator has its innerperiphery provided with circumferentially spaced recesses 40 formingcircumferentially spaced poles 4|, 42, 43 and 44 corresponding in numberand arrangement to the poles |5 to l8 respectively of the stator Thepoles 4| to 44 inclusive of the stator 31 are Provided with coils 45, 4641 and 43 similar to the coils l9 to 22 respectively of the stator Thecoils 45 to 48 inclusive are each connected at one end thereof byconductor wires 50, 5|, 52 and 53 with the suppressor grid and plate ofthe vacuum tubes 24 to 21 respectively while the P posite end of saidcoils are each connected by a common wire 54 to one end' of a secondarywinding 55 of a transformer 56.

The opposite end of the secondary winding of the transformer 56 isconnected by a conductor wire 51 to the conductor wire 34 and by jumperwires 58, 59 and 6|] with the conductor Wires 33, 3i and 28respectively. The primary winding of the transformer 56 is connectedwith a source of alternating current supply by conductor wires 60 and6|, the conductor wire 66 being connected by a conductor wire 62 to theconductor wire 34 and by said jumper wires to the conductor wires 33, 3|and 28. The opposite conductor wire 6| leading from the primary of thetransformer 56 is connected by a conductor wire 63 to current limitingresistances 64, 65, 66 and 61 which are arranged in parallel andrespectively connected by conductor wires 68, 69, 10 and 1| with theconductor wires 29, 36, 32 and 35.

In order to prevent the flow of current from the source of supply to thecontrol grids of the tubes respectively current blocking resistances 12,13, 14 and 15 are arranged in said circuit between the juncture of theconductor wires 68, 69, 16 and 1| with the conductor wires 29, 36, 32and 35 respectively and the control grids of the vacuum tubes 24, 25, 26and 21.

The conductor wires 50, 52 and 53 are each provided with reactance coils16, 11, 18 and 19 respectively which function to smooth out thepulsations in the current flowing from the plate to the coils 45, 46, 41and 48 respectively. The transformer 56 is also provided with asecondary winding 86 which is connected by conductor wires Bi and 82with the filaments of the tubes respectively.

opposite directions. When the rotor l2 of the control device I!) islocated with the recess 23 thereof disposed in radial alignment with thepole Fe, a maximum voltage drop will occur across the coil thereof witha consequent maximum flow of current through said coil. This willproduce a maximum voltage drop on the control grid thereby causing amaximum flow of current to the plate of the tube 24 and thence to thecoil 45 of the indicator 56. From the coil 45 the current will flowthrough the conductor wire 54 and to the secondary winding of thetransformer 56 and from the opposite end of the secondary winding of thetransformer 56 through the conductor wire 51 and the jumper wires to theconductor wire 28 r and thence to the cathode of the tube 24.

The rotor 38 of the indicator 35 is recessed on opposite sides witharcuate peripheral face portions arranged between said recesses, whichface portions are formed concentrically with the inner faces of thepoles of the stator 31 and are spaced therefrom to provide a narrow airgap therebetween. The rotor is permanently magnetized so that the endsthereof will be of opposite polarity. The flow of current in the coilsrespectively of the indicator 36 will set up magnetic fields which willattract the rotor and cause the same to align with the lines of forcepassing through the poles. Thus when the coil 45 has the maximum flow ofcurrent therethrough the rotor 38 will be rotated as indicated to aposition in radial alignment with the pole 4| corresponding to theradial position of the recess 23 of the rotor I! of the control deviceI9. In like manner, movement of the rotor l2 to any position so as tocause a voltage drop across any one of the coils I9, 20, 2| and 22 oracross any two adjacent coils thereof will produce a flow of current inthe corresponding coil or coils in the indicator so as to effectmovement of the rotor 33 to a position in alignment with the rotor I2 orin which the end indicated as of north polarity is located in the sameposition as the recess 23 of the rotor H.

The stator H and rotor H! of the control device H] are each made up oflaminated sheet iron stampings which are secured together in any desiredmanner. The stator l is affixed to a base 84 which is provided withspaced upstanding posts 85 in which the shaft l3 of the rotor I2 isjournaled for rotation. An operating handle 86 is afi'fixed to the outerend of the shaft |3 for manually turning the rotor 92 so as to set thesame in any desired position. For this purpose, the handle is providedwith a spring pressed detent 81 disposed in radial alignment with a.peripherally notched annulus 88 affixed to a panel 89 in surroundingrelation with the shaft 3. The panel 89 is affixed to the base 84 and isprovided on the outer face thereof with a dial 96 graduated in 369degrees and in revolutions per minute or other indicia so that thehandle 85 may be turned to set the rotor |2 to indicate by the locationof the handle thereof the reading on the dial corresponding to theinformation or message to be transmitted to a distant point and whichwill be correspondingly indicated on the indicator 36.

The stator 31 and rotor 38 of the indicator 36 are similarly made up oflaminated sheet iron stampings which are secured together in any desiredmanner. The stator 31 is affixed to a. base 92 which is provided withspaced upstanding posts 93 in which the shaft 35 of the rotor, ismounted for rotation. The stator is provided with a pointer 94 securedto the outer end thereof in overlying relation with a dial 913 affixedto a panel 96 secured to the side of the base 92. The dial 95 isgraduated in degrees and revolutions per minute or other indiciacorresponding to the graduations on the dial 9B of the control device l3whereby the movement of the rotor 38 controlled by the movement of therotor |2 of the control device will effect movement of the pointer 94 tocorrespond with the setting of the operating handle 86.

What is claimed is:

1. In a telemetric system, a control device ineluding a stator having aplurality of poles with independent coils for producing a magnetic fieldpassing through the poles respectively, a rotor mounted for rotationwithin said stator and having a recess in the periphery thereofsubtended by an are substantially equal to the arc subtended by thepoles respectively, a responsive deviceineluding a stator having polescorresponding in number to the poles of the control device andrespectively provided with coils for producing a magnetic field passingthrough each of the poles, a permanent magnet mounted for rotation insaid stator and having opposite ends formed concentric with said poles,vacuum tubes corresponding in number to the number of poles of thestator of said control device, said tubes having their cathodes andcontrol grids connected with the opposite ends of the coils of thestator of said control device respectively and the suppressor grids andplates of said tubes being connected with the coils of the responsivedevice respectively at one end thereof, a transformer adapted to beconnected with a source of alternating current supply and having asecondary winding connected in circuit with each of the coils of saidresponsive device and in circuit with each of the coils of the controldevice for producing a magnetic field in the stator of the responsivedevice to cause the permanent magnet to be rotated to a positioncorresponding to any setting of the rotor of the control device.

2. In a telemetric system, a control device including a stator having aplurality of poles with independent coils for producing a magnetic fieldpassing through the poles respectively, a rotor mounted for rotationwithin said stator and having a recess in the periphery thereofsubtended by an are substantially equal to the arc subtended by thepoles respectively, a responsive device including a stator having polescorresponding in number to the poles of the control device andrespectively provided with coils for producing a magnetic field passingthrough each of the poles, a permanent magnet mounted for rotation insaid stator and having opposite ends formed concentric with said poles,vacuum tubes corresponding in number to the number of poles of thestator of said control device, said tubes having their cathodes andcontrol grids connected with the opposite ends or the coils of thestator of said control device respectively and the suppressor grids andplates of said tubes being connected with the coils of the responsivedevice respectively at one end thereof, the coils of said control deviceand the coils of said indicator device each being in circuit forconnection with a source of current supply for directing the currentthrough adjacent coils of the stator of the control device in oppositedirections and through the coils of the stator of the responsive deviceuniformly in the same direction for producing a magnetic field in thestator of the responsive device to cause the permanent magnet to berotated to a position corresponding to any setting of the rotor of thecontrol device.

3. In a telemetric system, a control device ineluding a stator having aplurality of arcuately spaced poles and independent coils thereon forproducing a magnetic field passing through the poles respectively, arotor mounted for rotation within said stator and having a recess in theperiphery thereof for providing an enlarged air gap between the face ofthe recessed portion and the periphery of the poles, a responsive deviceincluding a stator having poles corresponding in number to the poles ofthe control device and respectively provided with coils for producing amagnetic field passing through each of the poles, a permanent magnetmounted for rotation in said stator, vacuum tubes corresponding innumber to the number of poles of the stator of said control device, saidtubes having their cathodes and control grids connected respectivelywith the opposite ends of the coils of the stator of said control deviceand the suppressor grids and plates of said tubes connected with thecoils respectively of the responsive device at one end thereof toprovide an increased flow of current through the coil of the stator ofthe control device disposed in radial alignment with the recess in therotor thereof and a maximum voltage drop on the control grid of the tubein circuit with said coil tothereby cause an increased flow of currentthrough the coil of the stator of the responsive device in circuit withthe suppressor grid and plate of said tube to set up a magnetic field inthe stator of said responsive device to cause the permanent magnet to berotated to a position corresponding to any setting of the rotor of thecontrol device.

4. In a telemetric system, a control device including a stator having aplurality of poles with independent coils for producing a magnetic fieldpassing through the poles respectively, a rotor mounted for rotationwithin said stator and having a recess in the periphery thereofsubtended by an arc substantially equal to the arc subtended by thepoles respectively, a responsive device including a stator having polescorresponding in number to the poles of the control device andrespectively provided with coils for producing a magnetic field passingthrough each of the poles, a permanent magnet mounted for rotation insaid stator and havin opposite ends formed concentric with said poles,vacuum tubes corresponding in number to the number of poles of thestator of said control device, said tubes having their cathodes andcontrol grids connected with the opposite ends of the coils of thestator of said control device respectively and the suppressor grids andplates of said tubes being connected with the coils of the responsivedevice respectively at one end thereof, a transformer adapted to beconnected with a source of alternating current supply and having asecondary winding connected in circuit with each of the coils of saidresponsive device and in circuit with each of the coils of the controldevice to provide an increased flow of current through the coil of thestator of the control device disposed in radial alignment with therecess in the rotor thereof and a maximum voltage drop on the controlgrid of the tube in circuit with said coil to thereby cause an increasedflow of current through the coil of the stator of the responsive devicein circuit with the suppressor grid and plate of said tube to set up amagnetic field in the stator of said responsive device to cause thepermanent magnet to be rotated to a position corresponding to anysetting of the rotor of the control device.

ROLLAND F. PEARSON.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 1,564,788 Hildebrand Dec. 8, 19251,576,195 Junken Mar. 9, 1926 1,607,917 Rowland Nov. 23, 1926 2,379,417Conrad July 3, 1945

